Using closer to group together information at the bottom
of a division (especially in letters); the usual contents of
closer; difference between closer and
trailer

The closer element serves the same kind of function as
opener, but at the end of a div rather than at the
beginning. It groups together the elements which typically fall at the
end of a textual division (especially letters), such as signatures,
salutes, and dates. The significant elements it may contain are:

dateline

respLine

salute

signed

Closers and trailers are fairly close in function, but not
identical. We think of the difference as follows: closer is
for things which are part of the form of the thing whose end is being
marked: for instance, the closing salutation of a letter, the date or
signature at the end of a poem.

By contrast, a trailer marks the end of the division
itself—it is not part of the content of the section or division, but
is rather part of its enclosure. It complements the function of the
heading, in announcing the completion of a section of text. Things
which are typically encoded within trailer include words like
Finis or The End, or any other statement of conclusion which
appears at the end of a division, such as Here ends the first Chapter or That’s all, folks. Much less frequent, but illustrative:
the word Unfinished following the end of an unfinished poem.